The refinery, the largest employer in Curaçao in 1969, worked with a number of contractors. Wescar or “Werkspoor Caribbean NV” was one of them. The workers of the contractors were paid less than the Shell workers for equal labor.
When the Labor Agreement (CAO) of Wescar expired on 6 May and a new agreement had to be negotiated, the Wescar workers demanded "equal pay, for equal work." The Wescar management, however, did not - or at least insufficiently - meet their demands which led to a labor dispute. Ewald Ong A Kwie, president of the union "Curaçao Federation of Workers” (CFW), which represented Wescar workers, declared a strike and called for a solidarity strike. He received strong support. All subcontractors of Shell and other unions such as the General Dockworkers Union (AHU) and the Metal Workers Union (CADMU) expressed their support.
On the evening of 29 May, the unions met at the Casa Sindical in Pietermaai to decide whether a general strike would be declared. On that night the first signs of unrest were already visible when some passing cars were stormed. The next day, 30 May, a solidarity strike was announced. The strikers gathered at Post V; one of Shell’s entrances to the plant. The leaders of the dock workers, Wilson "Papa" Godett and Amador Nita, were also present at Post V.
The emancipation of the Afro-Curaçao citizens gained momentum, the call for the Netherlands to get behind the islands demands for independence grew louder, Aruba's call for “Status Aparte” (an autonomous status within the Kingdom) became more prominent, and minimum wage and labor were tightly regulated.